I'm going on a trip and want to put a movie on my tablet so I can watch it on the plane or anywhere I don't want to connect thru wi-fi. I've already purchased the movie through B&N. It can't download because there's not enough space. I'm going out to buy an SD card tonight (16GB at least).

How do I make the download go to the SD card and not the internal storage of the HD+? If it helps, my HD+ is a 16GB version and I've deleted or moved to the cloud anything I can. I still have 2+GB short.